What is the normal range of motion for elbow flexion?

The normal range of motion for elbow flexion is typically considered to be around 140 to 150 degrees. This range allows for optimal movement and function during activities that involve bending the arm, such as lifting objects or bringing food to the mouth. Therefore, 150 degrees is the most appropriate choice, as it reflects the upper limit of normal elbow flexion range.

While the other options might suggest varying degrees of elbow movement, they either fall below or fail to meet the higher threshold that ensures full functional capacity of the elbow joint. It's important to understand that a normal range of motion is crucial for performing daily activities effectively and can be influenced by factors such as age, physical conditioning, and injury history.